iOS Audio Processing Graph Demonstration

“An audio processing graph is a Core Foundation–style opaque type, AUGraph, that you use to construct and manage an audio unit processing chain. A graph can leverage the capabilities of multiple audio units and multiple render callback functions, allowing you to create nearly any audio processing solution you can imagine” –From Apple’ s Audio Unit Hosting Guide For iOS

audioGraph is a superset of Apple's MixerHost application.

Features include:

1. • Mono & stereo mic/line input
   

2. • Audio effects including:
   

3. • Ring modulator
   

4. • FFT passthrough using Accelerate vDSP framework
   

5. • Real-time pitch shifting and detection using STFT
   

6. • Simple variable speed delay using a ring buffer
   

7. • Recursive moving average filter with variable number of points
   

8. • Convolution example with variable filter cutoff frequency
   

9. • Stereo level meter
   

10. • Synthesizer example - sine wave with envelope generator
    

11. • iOS 5 features including:
    

12. • MIDI sampler audio unit
    

13. • File player audio unit
    

14. • Audio unit effects
    

15. • Runs on iPad, iPhone, and iPod-Touch
    

16. • Open source
    

17. • Available as free download from iTunes App Store
    

18. • Music by Van Lawton
    

19. • Plus everything from MixerHost
    

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